Damper



J. S. KNEE Dec. 1, 1931.

DAMPER Filed March 14, 1950 lllllllllllll lzw ezzfar (707222 Z3266 7 12 Zornzgw Q Hi Patented Dec. 1,- 1931 UNITED STATES JOHN s. KNEE, or eaaiiniaar'rnsirrometin DAMr a 7 Application filed. March 14,1230." Seria1iNo, -435,780.

'15 described in the body'of this specification and illustrated by the accompanying draw-- ings, in which: 7

' Figure 1 is a top plan view of the damper,

certain parts being shown in section taken on line 11 of Figure 2;

Figure 2 is an elevational view of the same, a portion of one end being broken away to show the interior, and showing in dotted lines fragments of the draft doors 25 in raised or open position; and

Figure 3 is afragmentary sectional view taken on line 33 of Figure 2.

The device'generally comprises a casing having draft doors at either side thereof, a partition interjacent the draftdoors, and end openings provided with annular flanges adapted to connect with sections of horizontally disposed furnace or stove pipe.

Referring to the drawings, the central part of the casing, generally designated 1, has a'rectangular horizontal bottom portion '2, square vertical end portions 3 and 4 with circular openings therethrough, and a rectangular horizontal 'top portion 5, to each end of which is secured by means of rivets 6, a pair of plates 7 whose outer ends are curled to form pintle bearings 8 for the suspension of the oppositely disposed draft doors 9.

The side parts of the casing are identical in construction, each having a rectangular horizontal bottom portion 10 and vertically disposed triangular end portions 11 whose outer edges slope from the side edge of the 'top' portion to the outer edge of the bottom portion-10. The inner edges of these portions and ll are bent-to form right an"- gularly disposedU-shaped grooves 12: into which fit. the flanges 13 of the centralpart of the casing, intongueand'groove relation- It willb'e seenthat the casing may be conammaf one integral sheet of metal,.but the construction 'herein shown and described is stronger'and less subject to distortion.

The circular openings in the end portions 3and 4ciof the casing liare provided with annular pipe-mounting members 14, which have outwardly "flanged portionsv 15 adapted-to abut against thefloutside of-the end walls 3, 4 acent the circularopenings, and are secured as by rivets 16 to auxiliary "annular members 17 telescoping therewith and likewise having-outwardly flanged portions -18 adaptedto abut against the inside of the' e nd :walls 3,4 adj acent'the circular openings? nf-The draft doorsl9 have their upper edges curled to form pintle bearings 19 forihingedly' securingthe draftfdoors to the opposite outerie'dges ofthe top portion 5 of the casing by the; pintl'es 20', which pass through "the bearings 19 on the doors and the bearings 8 on the topportion. "The draft doors are further provided with integral inwardly extending flanges 21 which are adapted to fit outside the end portions 11 of the casing, to provide a more perfect closure for the open sides of the, a

casing when the draft doors are in lowered or closed position. 2

Rigid bars 22 are secured as by rivets 23 to the draft doors intermediate the sides thereof, and have twisted portions 24 and upwardly-outwardly projecting tongue portions 25 which have at their upperends apertures 26. Chains 27 whose outer ends are secured in the apertures 26 have their inner ends connected to a link 28 situated directly above the center of the device. In cases where the damper is installed too near the ceiling or the chains are'otherwise hindered from passing upwardly, they may be secured in the I apertures 29 in the brackets 30, Which'are secured to the draft doors near the lower edges thereof by means of rivets 31'. In such cases the chains may pass through pulleys suspended from the ceiling or other suitable mooring and connected together at a point below the center of the casing.

Common means may be employed for exerting a pull upwardly (or downwardly in the exceptional cases above indicated) at the central point of connection of the chains, thus opening the draft doors as indicated in the dotted lines of Figure 2. These meansmay also include a Weight or its equivalent for counter balancing the doors in adjusted po sitions.

Midway between the open sides of the cas'-' ing and in longitudinal alignment with the circular end openings, is a vertically disposed i i plate 32- having horizontally projecting 'flanges 33 at its upper and lower edges, which are secured as by rivets 34 to the top and bottom of the casing, thus dividing the casing into twosections so that in the event outside air currents cause a difference in pressure at the two draft door openings, the draft entering one door. cannot pass through the casing and out the other door, but is properly carried with the products of combustion into the furnace or stove pipe or flue.

. The invention being intended to be pointed .out in the claim, is not to be limited to or by details of construction ofthe particular embodiment thereof illustrated by the'drawings or hereinbefore described. 7 I

Iclaim:

.In a damper; a casing having a top, a bottom, open sides, and end portions provided with openings therethrough adapted toconnect with sections of stove pipe, draft doors at the open sides of said casing, and a vertical plate inlongitudinal alignment with and between said openings in. said end portions.

. In testimony whereof I have hereunto set my hand at Grand Rapids, Michigan, this 22nd day of February, 1930.

JOHN S. KNEE. 

